Bartók’s Piano Concerto No. 3, 3rd movement
Hungarian composer Béla Bartók (1881 – 1945) did not quite complete his third piano concerto. He died with the last seventeen measures unwritten, composed by his close friend, Tibor Serly. In the linked performance on YouTube, the Third Movement begins at about 17:40. The entire concerto is about 25 minutes long in this recording.
Although the piece originally was planned as a concerto for two unaccompanied pianos, Bartók decided to recast it as a work for orchestra and solo piano.
When I was teaching piano, I frequently used Bartók’s collection of piano pieces Mikrokosmos. They are an amazing introduction to 20th-century piano idioms and techniques. They range through six volumes from the simplest little beginning pieces to advanced works suitable for the concert stage.